Set expression for formula field on Zoho Creator

Set expression for formula field on Zoho Creator

Hi guys, I am stocked with an apparently simple formula that should calculate the time between a “start time” and “end time” fields. Can some one please share some ideas to solve this?
The formula field should calculate and show the time in hours and minutes between two time fields (start time _ end time = total time spent).
Thanks in advance.

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